Irreversible humidity indicator cards
US6877457B1 · kind B1 · utility
6Cited by
36References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2004 |
| Grant date | Apr 12, 2005 |
| Priority date | — |
| Expiry date | Feb 26, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N31/222
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An irreversible humidity indicator card comprising an intermediate carrier member containing one or more holes, a clear, water vapor permeable first outer layer secured to the first side of the carrier member, a deliquescent material contained within the holes in the carrier member, a dark colored, absorbent sheet material secured to the back side of the carrier member to cover the holes in the carrier member and a second outer layer which covers the colored absorbent sheet material and a portion or all of the back side of the intermediate carrier member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.